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首页> 外文期刊>Materials Science and Engineering >Homogeneity improvement of friction stir welded ZK61 alloy sheets in microstructure and mechanical properties by multi-pass lowered-temperature rolling
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Homogeneity improvement of friction stir welded ZK61 alloy sheets in microstructure and mechanical properties by multi-pass lowered-temperature rolling

机译：多道次低温轧制提高搅拌摩擦焊接ZK61合金薄板的组织和力学性能的均质性

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摘要

Multi-pass lowered-temperature rolling was applied on the friction stir welded ZK61 magnesium alloy sheets not only for fabricating wide high-performance wrought magnesium alloy sheets, but also for reducing the sheet inhomogeneity including the microstructure and mechanical properties induced by friction stir welding. Results showed that obvious microstructure inhomogeneity including plannar texture anisotropy between the base metal and the stir zone were introduced in the friction stir welded ZK61 alloy sheets, but can be strikingly weakened by hot rolling deformation via multiple dynamic recrystallization. These led to a uniform fine-grained structure of about 8 urn in average grain size and similar (0002) basal texture in the final 1.4 mm thick sheets, and brought a continuous improvement in the associated property differences, where the relatively lower yield strength in base metal zone was strongly correlated with spreading (0002) texture while higher values in stir zone with stable intense (0002) texture. Moreover, the experimental and calculated Hall-Petch relationships were investigated to explain the different evolution of yield strength between the base metal and the stir zone. Meanwhile, enhanced fracture elongations larger than 20% in both the base metal zone and the stir zone were primarily attributed to grain refinement.
机译：在摩擦搅拌焊接的ZK61镁合金板上进行了多道次低温轧制，不仅用于制造宽阔的高性能锻造镁合金板，而且还用于降低板不均匀性，包括由摩擦搅拌焊接引起的组织和机械性能。结果表明，在摩擦搅拌焊接的ZK61合金薄板中引入了明显的组织不均匀性，包括贱金属和搅拌区之间的平面织构各向异性，但通过多次动态重结晶可通过热轧变形显着地减弱。这些导致最终的1.4毫米厚片材中平均晶粒尺寸均匀的细晶粒结构约为8微米，并且具有类似（0002）的基础纹理，并带来了相关性能差异的持续改善，其中屈服强度相对较低。贱金属区域与扩展（0002）织构密切相关，而搅拌区域中较高的值具有稳定的强烈（0002）织构。此外，研究了实验和计算出的霍尔-帕奇关系，以解释贱金属和搅拌区之间屈服强度的不同演变。同时，贱金属区和搅拌区的断裂伸长率均大于20％，这主要归因于晶粒细化。

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  • 来源
    《Materials Science and Engineering》 |2017年第4期|17-26|共10页
  • 作者

    Wenke Wang; Wencong Zhang; Wenzhen Chen; Jianlei Yang; Lixin Zhang; Erde Wang;

  • 作者单位

    School of Materials Science and Engineering Harbin Institute of Technology, Weihai 264209, PR China;

    School of Materials Science and Engineering Harbin Institute of Technology, Weihai 264209, PR China;

    School of Materials Science and Engineering Harbin Institute of Technology, Weihai 264209, PR China;

    School of Materials Science and Engineering Harbin Institute of Technology, Weihai 264209, PR China;

    School of Materials Science and Engineering Harbin Institute of Technology, Weihai 264209, PR China;

    School of Materials Science and Engineering Harbin Institute of Technology, Weihai 264209, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ZK61 alloy; Multi-pass lowered-temperature rolling; Texture; Friction stir welding; Yield strength;

    机译：ZK61合金;多道次低温轧制;质地;搅拌摩擦焊;屈服强度;

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